Driver for lathes



(-No Model.) r F. U. BEARD.

DRIVER FOR LATHES. No. 280,119. Patented June 26, 1883.

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WITNESSES XNVENTOR V ATTORNEY6.

N RS Phnln-Lvthngraphur. Waslung'o n c UNITED STATES PATENT OFFICE.

DRIVER FOR LATH ES.

SPECIFICATION forming part of Letters Patent No. 280,119, dated June 26,1883.

Application filed March 19, 1883. (No model.)

Improvements in Double Drivers for Lathe Face-Plates; and I do herebydeclare that the following is afull, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked'thereon, whichform a part of this specification.

My improvements will be readily understood from the followingdescription, aided by the drawings. .The device is intended to besecured to the lathe-spindle similarly to the face-plate in general use,and while particularly suitable for axle-lathes or for pulley lathes, itis useful for lathes generally.

The object of the invention is not only to drive the work (say a shaft)from two sides in stead of from one side only, but also to make thedriver selfadjusting, so that it will always bear equally against thetwo driving-points, and thus prevent chattering and trembling of theshaft.

Figure 1 is a front elevation; Fig. 2, a side elevation; Fig. 3, an endelevation; Fig. 4, a

section through the line a: x of Figs. 1 and 2; and Fig. 5, an elevationsubstituting a straight bar for the disk.

A is the face-plate, to be secured onto the lathe-spindle in the usualmanner. It is provided with ears I) b, which serve as journalbearingsfor the double driver 0, the opposite ends of which are journaled inthese ears. This driver has two parallel dogs or drivingarms, (Z (l,diametrically opposite each other, as shown, and against its centralportion, 0, bear the springs c e, which tend to keep the arms 01 dperpendicular to the face-plate.

It will be seen that when the driver is applied for use upon a lathe itstwo arms will not only drive at opposite sides of the center, but, asthe arms are free to rock or vibrate together in either direction, theywill automatically adjust themselves so as to bear equally upon 'the twodriving-points, preventing all chattering or trembling of the work,while the springs serve to keep the driver in proper position andprevent its rocking violently in case the lathe should be run idle-1 0.,having nothing in it to drive.

This improvement is particularly adapted to axle-lathes, and in fact toall lathes where the face-plate drives the work. For pulleylathes it isespecially suitable, because the projecting studs or dogs come in directc011- tact with the arms of the pulley, dispensing entirely with thecustomary dog, clamp, or carrier.

Instead of making the face-plate A circular in form, as shown, it may bein the form of a straight piece or bar, as shown in Fig. 5, theconstruction in all other respects being the same.

In some cases, if desired, the springs may be dispensed with, the rockerand its arms and the other parts remaining unchanged.

I claim- I g 1. A double driver for lathes, consisting ofa bed orface-plate, combined with a yielding rocker journaled thereon andprovided with driving arms or dogs, substantially as set forth.

2. The combination of a face-plate, A, having journal bearings or earsI) I), the double driver 0 d d, and springs e e, the combination beingand operating substantially as shown and described.

FREDERICK O. BEARD.

Vitnesses:

M. O. SoUTHwonrH, w G. O. SHIBLEY.

